Type head for typewriters and the like



A. RODRIAN March 25, 1930.

Filed De c. 16, 1927 Patented Mar. 25, 1930 UNITED STATES AliBERTnoniamn, or

ro'rsnAM, GERMANY TYPE HEAD FOR TYPEWRITERS AND THE LIKE Applicationfiled December 16, 1927, Serial No. 240,531, and in Germany March 24,1927.

. My invention relates to improvements in type heads adapted to bemounted on type levers such as are used in typewriters. -The benefit ofthe invention is found in the oper- 5 ationin which the type head andlever to be connected are placed on a gauging apparatus, the correctrelative position of the head and lever being insured by means of a marksuch as a nose corresponding to a corresponding indentation provided onthe gauging apparatus. In the method now in use the gauge mark isprovided between pairs of types provided on the type head, the said markbeing either in the form of a nose projecting from the head or of anindentation. I have "found that when providing a nose on the type headthe said nose will produce an impression on the paper when using thetype lever in the typewriting machine, because the 0 said nose isnecessarily close to the types. When constructing the said mark in theform of an indentation it is difiicult to manufacture the die from whichthe ty es are made, for the reason that the portiori of the die formingthe indentation prjects from the bottom of the diewhile the j igo'rtionsforming the letters are sunk in the said bottom. Thus when cutting thedie the steel block musthave a thickness such that a thickness corre- 5sponding to the height of the projectingporwith amark'in the form of aprojecting nose,

the said mark being spaced from the, type head so far that it does notspoil the. paper when printing. In the preferred embodiv ment myinvention consists in providing the mark on a portion'of the type headwhich can I a be readily removed from the body thereof,

the said portion bein preferably reduced in thickness as compare to thebody of the type head or separated therefrom by an indentation. In orderthat my invention be more clearly understood an apparatus suitable forputting my improved method into eifect has been shown in theaccompanying drawing," in which Fig. 1 is a sectional elevation showingthe gauging apparatus with a type lever and type head placed thereon, I

Fig. 2, is a top'plan view of Fig. 1, Fig. 3, is'a detail new on anenlarged scale and partly in section and showing the type' head and apart of the gauging apparatus, and g 5 Fig. 4, is asectional elevationtaken on theline 4-4 of Fig.3. a L i In the example shown in the drawingthe gauge apparatus comprises a gauge block 1 r in the form of a segmentthe dimensions of which correspond to the segment of the typewritingmachine on which the type levers are mounted, and a gauge block 6adapted to receive the type heads 7 in the proper osition relatively tothe segmental gauge lock 1. The blocks 1 and 6 are fixed to a base plate5 by means of screws Band 19, the relative posigons of the said partsbeing such that when fixing the type head 7 to the type lever 3 thetypes are in the correct position relatively to the-segment of thetypewriting' machine and the printingpoint thereof. The levers '3 are{mounted on the block 1 in the" proper position by means ofa pivot bolt4. urther, the block 1 is formed with an abutment 9- corresponding to anose 10 formed on the lever 3, the obiect of the said abutment and nosebeing to hold the outer end of the I type lever the proper distanceawayfrom the top face of the block 6. Further, to the block 90 1' an arm 2is fixed which is turned upwardly at its outer end, the said upwardlyproject= ing end being formed with a notch corresponding to a heel 11,formed on the outer end of the lever 3. Thus-the outer ends of thelevers'placed on the block 1 are held in the proper position relatively,to the block 6' i by the said arm.

As shown, the type head is formed with two types 15 and 16, and inaddition it is 106 raised part of the bottom. Further, the block I 6 isformed with an indentation 23 corresponding to the nose 13. Thus, whenplacing the type head 7 on the block 6, the head is supported with itstype 16 on the elevated portion 12 of the bottom of the recess 14 andwith its nose 13 in the indentation of the block 6, and the distancebetween the indentation 23 and the pivot bolt 4 is such that the typehead 7 placed on the block 6 is the roper distance away from the pivotbolt 4. t will be understood that in all the type heads to be adjustedbymeans of the gauging apparatus the distance between the nose 13 and thetypes 15 and 16 is exactly alike.

For fixing a type head 7 to the type lever" 3 the said lever is placedon theblock 1 so that the pivot bolt 4 passes through the bore of thelever 3 corresponding thereto,

and the nose 10 bears on the abutment 9.

The end of the type lever engages with the heel 11 in the notch of thearm 2 corresponding thereto. Thus the type lever '3 is exactly in thecorrect position. The type head 7 corresponding to the key lever 3 isplaced on the block 6 with the nose 13 fitting in the indentation 23 andthe type 16 hearing on the portion 12 of the bottom of the recess. Nowthe head 7 is soldered or otherwise fixed to the key lever 3.

The type head 7 is shaped in a die or matrix and this die or matrix isshaped by cutting with a fraising tool. If the positioning meansemployed for setting the type head 7 upon the gauge block 6 were in theform of a recess upon the type head and a nose upon the gauge block,positioning could not be effected with suflicient accuracy. The recessesin the die or matrix" in which the types 15 and 16 are themselves formedare cut by means of the tool alluded to, and this if, instead of a nose,the type head 7'were to'be" provided with a recess, as its element ofthe positioning means, the die or matrix-would have to be formed with acorresponding projection, and such projection upon the face of the dieor matrix would have-to 'be formed -by a tool adjusted in a difierentmanner,

and the positioning of the projection relameans which the type head 7carries must,

therefore, be a projection, as the type also which the type head.carries are projections. Otherwise, accuracy of spacing as between thetype themselves and the positioning means is impossible ofaccomplishment. A difliculty, however, remains; as already stated, it isobjectionable that the type head carry as its element of the positioningmeans a projection, for the projection being present is liable to makeunsightly marking upon the paper when the type head is in service. Myinvention then involves further the formation of this projecting elementor nose upon a deciduous extension of the type head, and, after thepositioning means have served their purpose,.this extension is cut away.

Thus the desired accuracy is achieved without prejudice to the utilityof the finished article. i i

As appears from Fig. 2, the segment 1 is formed with a series of slots22 each adapted to receive a key' lever.

After thetype head has been fixed to the key 3 the heel 8 is removedtherefrom by means of a pair of tongues, by grinding, or by othermethods. v

In the example shown in the figures a gauging apparatus independent ofthe typewriting machine is provided for fixing the type heads to thetype levers. But I wish it to be understood that'I do not limit myselfto thisfeature, and that in some cases the segment 1 is taken from thetypewriting ma chine to be provided with the tiygpe levers, so that aseparate segmental bloc 1 may be dispensed with.- Further, the operationof adjusting the type heads and fixing the same to the type levers maybe performed on the typewritlng machine itself, in which case a gau eblock such as 6 is temporarlly fixed to the typewriting machine in. theproper position relatively to the segmenthaving the type leverspivotally mounted thereon.

Iclaim: g

1. A type-head, adapted for assembly in properly gauged spacerelationship with a type-lever, said type-head consistm body providedwith a pluralityof pro ectlng types and provided further with theprojecting element of a projection-and-recess alignment device, suchmember belng ar ranged beyond the area included byand between said typesand being accurately spaced with respect to said types.

2. A type-head, adapted for assembly 1n properly gauged spacerelationship w1th a type-lever, said type-head consisting of a bodyprovided with projecting-type and provided further with a removablelateral extension, such lateral extension bearing a pronose accuratelyspaced with respect type and adapted to engage a corresponding recess ina carrier.

3. In apparatus for adjusting type-heads on type-levers, acarrierequipped at one end with positiomng means adapted to be 'en gaged by thetype-lever and at the other end with a seat upon which the type-head,may

- be adjusted to tion to effect accurate placement of the type:

head on such seat.

' 'In testimony. whereof I hereunto aifix my signature. I

ALBERT RODRIAN.

adjacent such seat, and be-

